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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2013
Pension and Other Postretirement Benefit Plans [Abstract]  
Components of Net Periodic Benefit Expense [Table Text Block]
 
Pension
 
Other
Postretirement
Components of Net Periodic Benefit Expense
2013
 
2012
 
2013
 
2012
Millions
 
 
 
 
 
 
 
For the Quarter Ended March 31,
 
 
 
 
 
 
 
Service Cost

$2.5

 

$2.3

 

$1.0

 

$1.0

Interest Cost
6.5

 
6.6

 
1.7

 
2.4

Expected Return on Plan Assets
(8.8
)
 
(8.8
)
 
(2.5
)
 
(2.5
)
Amortization of Prior Service Costs
0.1

 
0.1

 
(0.6
)
 
(0.4
)
Amortization of Net Loss
5.3

 
4.3

 
0.4

 
1.9

Net Periodic Benefit Expense

$5.6

 

$4.5

 
—

 

$2.4